Will It Affect The Guy?

It's rare but possible. It will appear as a reddish rash on the head of the penis. It can be treated with monistat (yes guys can use it) until it goes away.

A suggestion is to refrain from sex with your girl until she has the infection cleared up. Otherwise, it's possible that you could continue to reinfect her.

From whatever I've heard or read, a guy rarely gets the infection when he has sex with a girl who has it. If he's one of those rare few, it's like lordian said in his answer, see a doctor and he should be able to have that taken care quite easily.

It isn't a yeast infection, and it is rare, but yes men can get an itchy red rash from a yeast infection if he has sex with a girl who has one. If this happens, see a doctor.

Yeah a while back I used to get them all the time and then I got with my boyfriend and infected him, it was a reddish rash on his bell. we broke up but stayed friends. The weird part is when we broke up I stopped getting them but he still gets thrush everytime he has sex, whoever it's with. (we're still very good friends).